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SCJP 1.6版考題 077 - 修訂歷史
2026-04-30T23:43:59Z
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Ikk：新頁面: 11. public static void main(String[] args) { 12. Object obj = new int{1, 2, 3}; 13. int[] someArray = (int[])obj; 14. for (int i: someArray) System.out.print(i + " "); 15. }...
2013-03-30T06:16:39Z
<p>新頁面: 11. public static void main(String[] args) { 12. Object obj = new int{1, 2, 3}; 13. int[] someArray = (int[])obj; 14. for (int i: someArray) System.out.print(i + " "); 15. }...</p>
<p><b>新頁面</b></p><div> 11. public static void main(String[] args) {<br />
12. Object obj = new int{1, 2, 3};<br />
13. int[] someArray = (int[])obj;<br />
14. for (int i: someArray) System.out.print(i + " ");<br />
15. }<br />
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What is the result?<br />
A. 1 2 3<br />
B. Compilation fails because of an error in line 12.<br />
C. Compilation fails because of an error in line 13.<br />
D. Compilation fails because of an error in line 14.<br />
E. A ClassCastException is thrown at runtime.<br />
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<span style="font-size:medium;">解答</span><br />
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<span style="font-size: medium;">Ans: A </span><br />
<br />
<span style="font-size:medium;"> 解說:<br />
此題正常編譯可執行，第12行先用一個父類別型態Object的物件參考指向一個一維的整數陣列<br />
Everything is an object, 這句話代表只要是Object型態的物件參考，就可以指向系統中任一型態的物件，如此題中的obj。<br />
13行，等號的右邊是Object型態的物件參考，等號右邊是父類別(大)，指定給子類別時須進行轉型的動作，<br />
可進行轉型的基礎是obj所指的物件型態必須是int[]。<br />
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{{SCJP 1.6版考題講解}}</div>
Ikk